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Age 14 to 16
ShortChallenge Level 
If $p$ is a positive integer and $q$ is a negative integer, which of the following is the greatest?
$p-q$ $q-p$ $p+q$ $-p-q$
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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